Roller-bushing for sheaves.



W. F. WELLMAN. ROLLER BUSHING FOR SHEAVES.

I v (Application filed Feb. 3, 1902.) (No Model.)

WITNESSES:

JJJVW TNVENTU wqemw Patented Sept; 30, I902.

To all whom it may concern).-

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section on line 2 2 of Fig. 1.

, the outer hearing or raceway for a' series of.

UNITED STATES A fication.

ley 0, so that they can be. forced into themarginal portions of the two mem bers are PATENT I OFFICE.

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SPECIFICATION forming part of Letters Patent No. 710,088, dated September 30, 1902.

Application filed February 9,1902. sent! No. 92.294. on modal-i Be it known that I, WILLARD F. WE'LLMAN, of Belmont, in the county of Waldo and State of Maine,- have invented certain new and useful Improvements in Roller-Bushings for Sheaves, &c. of which the followingis a speci- This invention relates to a bushing for sheaves and pulleys, said bushingcomprising a cylindrical chamber formed for attachment to the center of a pulley and adapted to present a cylindrical bearing to the peripheries of a series of rolls and to confine said rolls againstdisplacement in any direction, the rolls being arranged in a circular series surrounding the pintle or journal on which the pulley rotates.

The inven tion consists of the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a' part of this specification, Figure 1 represents a side elevation of a] sheave or pulley having a bushing embodying my invention, a part of the bushing being removed to show the internal rolls and. sleeve. Fig. 2 represents a The same characters of reference indicate the same parts in all the figures.

In the drawings, 0' represents the body of the sheave, which is castorotherwise formed with a central aperture orsocket to receive, the bushing, the latter being composed of two members a b, which are formed to have a drive fit in the wall of the socket in the pul- 'the socket by a strongpressure and when inserted are held by frictionfln the pulley. Each member com prises a cylindrical marginal portion 2 and a flange 3, formed on one end'ol' said marginal portion. 'The meeting ends of formed to be detach ably coupled or connected together within the pulley, as shown in Fig. 2, the two. members collectively forming a bushing having a chamber with a cylindrical marginal bearing-surface 4, whielrconstitutes bearing-rolls 5 and a series of separating-rolls 6. The flanges 3 prevent endwise displacement of the rolls5 and (I,

7 represents a/s'leeve which is formed to 5 and prevent inward movement of said rolls toward the axis of the bushing. Said sleeve is of greater diameter than the openings 8, surrounded bythe end flanges 3, so that the sleeve'isconfined within the bushing against endwise displacement by said end flanges. The sleeve .is looselyinserted' in the bushing and is formed to be contained in the space between. the flanges 3. The interior of the sleeve is formed to receive and closely fit the pintle or hearing 9, on which the bushing and sheave rotate. In practice the pintle is driven with a tight friction fit into the sleeve, so that when the sheave is in use the sleeve becomes practicallya part or enlargement of the pintle and does not rotate with the bushing and rollers. To insure a sufficiently tight frictional fit between the sleeve and the pintle, I prefer to slightly taper the interior of the sleeve andcorrespondingly taper the portion of the pintle which enters the sleeve. The pintle can therefore be driven into the sleeve until the two are firmly interlocked by friction and can at 'any time be driven out whenever it is necessary to' renew the sleeve 7 or the rollers or to obtain access to the interior of the bushing for any purpose.

It will be seen that the sleeve protects the pintle from wear and that the pintle can be removed and a new sleeve put on as often. as the same may be required. The sleeve is preferably made somewhat shorter than the space between the flanges 3 of the bushing, so that the sheave may have a slight oscillating movement on the pintle against the blockstraps on the side without bringing the shell in contact with the end of the sleeve. be olisei'ved-tl1at the sleeve prevents the rolls from dropping toward the center or axis of the bushing whether the pintle is in place or not. Theemployment, of the sleeve enables the holes inthe end of theshell to be made much smaller than they can be in many other bushings, so that there is less liability of the entrance of foreign matter into the interior ,of the bushing than usual.

'lhisimproved bushing may .be used in sheaves for sh'ips blocks and for any other.

uses to which an antifriction-bushing his-3p;-

plicat n. I claim- A roller bushing' comprising two sepabear upon the ner'sides ofgthe bearing-rolle It will,

I95 rable bushing gnembersyada'p ted soaentera socket in a sheave or pulley, each member having a cylindrical recess at its inner side the margin of which forms a raceway and an annular flange at its outer end forming an end Wall of the recess, a series of bearingrolls in contact with the cylindrical margin of the chamber, a series of separatingrolls in contact with the said cylindrical margin and with the bearing-rolls, the said rolls being confined against endwise displacement by said end walls, and a sleeve in contact with the inner surfaces of the bearing-rolls and preventing inward movement thereof, toward the axis of the bushing, said sleeve being confined against endwise displacement by said end walls and formed internally to receive the journal or pintle on which the sheave rotates. v

2. A roller-bushing comprising two separable bushing members adapted to enter a socket in a sheave or pulley, each member having a cylindrical recess at its inner side the margin of which forms a raceway and an annular flange at its outer end forming an end wall of the recess, a series of bearingrolls in contact with the cylindrical margin of the chamber, a series of separating-rolls in contact with the said cylindrical margin and with the bearing-rolls, the said rolls being confined against endwise displacement by said end Walls, and a sleevein contact with the inner surfaces of the bearing-rolls and preventing inward movement thereof, toward the axis of the bushing, said sleeve being confined against endwise displacement by said 35 end walls and internally tapered to receive and engage a tapered journal or pintle.

In testimony whereof I have affixed my signature in presence of two witnesses.

WILLARD E. WELLMAN.

Witnesses:

B. H. CONANT, L. M. SLEEPER. 

